Optometric Personnel Act Article 29
The founding of a municipal or county (city) optician association may be initiated by a group of opticians in a municipality or county (city) that is composed of 21 members or more; opticians in a region with less than 21 members may join the association of a neighboring region or form as a joint association.
中文原文 驗光人員法第29條
直轄市、縣（市）驗光師公會，由該轄區域內驗光師二十一人以上發起組織之；其未滿二十一人者，得加入鄰近區域之公會或共同組織之。